An erection results from an increase in blood flow to the penis. According to the FDA, generic medications contain the same active ingredients as brand names, meaning there’s no difference in effectiveness or safety. People taking nitrates like nitroglycerin Nitrostat or isosorbide mononitrate Imdur should not take PDE5 inhibitors, as doing so could result in a dangerous drop in blood pressure. The dose may be increased to a maximum of mg or decreased to 25 mg depending on the effectiveness and side effects. For more information about treatment with Sildenafil Actavis, read the package leaflet also part of the EPAR or contact your doctor or pharmacist.£ per tablet Lowest price guarantee Includes FREE private prescription Get started now Receive it: Monday Order within: 39 min 52 sec Commonly bought add-ons Durex Pleasure Me (x12) Only £! Add to Cart or Durex Thin Feel (x12) Only £! Add to Cart Compare our Sildenafil prices – Lowest Price Guarantee (find out more)Missing: europe. Men will no longer require a prescription to obtain the impotence drug Viagra and will instead be able to buy it over the counter at pharmacies. The decision by the UK Medicines and Healthcare. Viagra is used to treat adult men with erectile dysfunction (sometimes called impotence), when they cannot get or keep a sufficiently hard penis (erection) for satisfactory sexual activity. For Viagra to be effective, sexual stimulation is required. The medicine can only be obtained with a prescription.